Pritchard Sullivan
11/29/2023 · High School

19. Стрелок ведет стрельбу по мишени до первого попадания, имея боезапас 4 патрона. Вероятность попадания при каждом выстреле равна 0,6 . Построить закон распределения случайной величины - числа использованных патронов. Найти математическое ожидание, дисперсию. Записать функцию распределения

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Закон распределения случайной величины \( X \) (числа использованных патронов) до первого попадания: \[ \begin{align*} P(X = 1) & = 0.6 \\ P(X = 2) & = 0.24 \\ P(X = 3) & = 0.096 \\ P(X = 4) & = 0.0384 \\ \end{align*} \] Математическое ожидание \( E(X) \approx 1.5216 \) Дисперсия \( D(X) \approx 0.2612 \) Функция распределения: \[ F(x) = \begin{cases} 0 & \text{если } x < 1 \\ 0.6 & \text{если } 1 \leq x < 2 \\ 0.84 & \text{если } 2 \leq x < 3 \\ 0.936 & \text{если } 3 \leq x < 4 \\ 1 & \text{если } x \geq 4 \end{cases} \]

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